| 摘要 |
A system for detecting an object comprises a transmitter/emitter module adapted to remotely alter the appearance of an object, an imaging device arranged to capture image data while the appearance of the object is altered, and a processing module arranged to select a region within the captured image data and compare a variation in pixel values in the region to an expected variation based on information about the altered appearance of the object, to determine whether the object is located in the region. In some embodiments, the object may include a liquid crystal LC shutter switchable between states having different optical properties, such as a transparent state and an opaque state, and the transmitter/emitter may be adapted to send a signal to the object to switch the LC shutter. In other embodiments, the object may include a polarising filter, and the transmitter/emitter may be adapted to illuminate the object with polarised light to alter the luminance of the polarising filter in a captured image. The object may be a pair of glasses wearable by a user, for example active or passive glasses for viewing visual data reproduced in a 3D reproduction mode and the display mode is be switched to 3D mode on detection of the user wearing glasses. The system may execute a facial-recognition algorithm as part of the process to identify the glasses and in the case of more than one user will switch to 3D mode if it is determined that a specified fraction of the viewers are wearing viewing glasses. |
